December 2003 - cypherpunks-legacy

hiding strings in binaries
by Alex Strasheim 17 Dec '03

17 Dec '03

-----BEGIN PGP SIGNED MESSAGE----- I didn't write this program and I don't know how it works. It was posted on the nyx freenet by kstern(a)nyx.cs.du.edu. When you compile and run it, it prints out the lyrics to "The Twelve Days of Christmas". As you might imagine from looking at the code, strings doesn't find anything in it. #include <stdio.h> main(t,_,a) char *a; { return!0<t?t<3?main(-79,-13,a+main(-87,1-_,main(-86,0,a+1)+a)): 1,t<_?main(t+1,_,a):3,main(-94,-27+t,a)&&t==2?_<13? main(2,_+1,"%s %d %d\n"):9:16:t<0?t<-72?main(_,t, "@n'+,#'/*{}w+/w#cdnr/+,{}r/*de}+,/*{*+,/w{%+,/w#q#n+,/#{l,+,/n{n+,/+#n+,/#\ ;#q#n+,/+k#;*+,/'r :'d*'3,}{w+K w'K:'+}e#';dq#'l \ q#'+d'K#!/+k#;q#'r}eKK#}w'r}eKK{nl]'/#;#q#n'){)#}w'){){nl]'/+#n';d}rw' i;# \ ){nl]!/n{n#'; r{#w'r nc{nl]'/#{l,+'K {rw' iK{;[{nl]'/w#q#n'wk nw' \ iwk{KK{nl]!/w{%'l##w#' i; :{nl]'/*{q#'ld;r#n'}{nlwb!/*de}'c \ ;;{nl'-{}rw]'/+,}##'*}#nc,',#nw]'/+kd'+e}+;#'rdq#w! nr'/ ') }+}{rl#'{n' ')# \ }'+}##(!!/") :t<-50?_==*a?putchar(31[a]):main(-65,_,a+1):main((*a=='/')+t,_,a+1) :0<t?main(2,2,"%s"):*a=='/'||main(0,main(-61,*a, "!ek;dc i@bK'(q)-[w]*%n+r3#l,{}:\nuwloca-O;m .vpbks,fxntdCeghiry"),a+1); } == Alex Strasheim | finger astrashe(a)nyx.cs.du.edu alex(a)omaha.com | for my PGP 2.6.1. public key -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBLvY1qxEpP7+baaPtAQHXLQP/Te/ttVPR7Ig6pV5Cq7imPZlHZ9pZZPpj NxVwdN7dlv1uUh7TYdqasTw4RunKe0Iip2zMDU1x6g8+Eg4XErc5pHLPICXDweGC hBBmMQeXcmCNrwL4w/d7G+6zoy3wkrwjo0pXsUYsPeGiOEDTAdNipoOL4NsCbZdK p5fzbCd7QAA= =0zOd -----END PGP SIGNATURE-----

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Re: Hiding strings in objects code
by Jef Poskanzer 17 Dec '03

17 Dec '03

>I assume you mean so that running "strings" on the binary will not >lead you to anything, right? You can use an XOR with some weird value >to hide the strings. Just make sure the value you use will, for >example, set the high bit on the string bytes... > >Its is a cheap, free way to hide strings. It is, by no means, secure. When rtm used this technique in his worm I'm sure a lot of people, such as myself, spent the five minutes necessary to hack up a program that tries XORing the input with all 256 possible bytes. I had the program pipe the output of each try through strings and wc, to check whether any significant text was uncovered. Only 0x00 and the single now-forgotten value he used got hits - no second XOR value. Anyway the point is it's *really* by no means secure, and you can do much better with a few minutes thought. Set up a basic framework using a Makefile that takes a file of MNEMONIC "text string" and runs it through an encoding program to produce a .h file of static char* text[] = { ... #define MNEMONIC 17 "vb4hv7789sd", Then in your actual program you just call decode(text[MNEMONIC]); Given that simple framework you can experiment with lots of different encoding and decoding functions. --- Jef

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Re: Anon remailer on new ISP ?
by L. McCarthy 17 Dec '03

17 Dec '03

-----BEGIN PGP SIGNED MESSAGE----- - -----BEGIN PGP SIGNED MESSAGE----- Dave Merriman writes: > Does anyone know if any of the 'standard' CP tools (remailers, etc) would > run on a Windows NT machine (server edition 3.5)? A couple friends and I are > under serious contemplation of setting up an ISP in a town of 100K+, and if > it's possible, I'd like to put an anon remailer on it. Great ! Two quick reactions: [] Would it be possible to run an anon-http server on it ? [] If you start a remailer-friendly site, I'd be very surprised if no-one here wanted to get an account there and establish a Windows NT remailer, written from scratch if necessary.... -L. Futplex McCarthy; PGP key by finger or server "The objective is for us to get those conversations whether they're by an alligator clip or ones and zeroes. Wherever they are, whatever they are, I need them." -FBI Dir. Freeh - -----BEGIN PGP SIGNATURE----- Version: 2.6.1 iQCVAwUBLvd8tmf7YYibNzjpAQEJGgP+NmDO/UKwXGPC2XcuEJLUQ78T4auvna+l ia5RNXEUVpXVlRrXgARxwN+gnh7AMxBLNNGBZUbawrlwcef8/olb5D7+y5tGp2ja RSbWhwmrOzl2dc/dCJ7fxlsvDc0r0z3/5v0TvYEU+ju3HOP2NoJ5pEl7uVttndqY eyPzdoZTfL8= =KrKW - -----END PGP SIGNATURE----- - --- [This message has been signed by an auto-signing service. A valid signature means only that it has been received at the address corresponding to the signature and forwarded.] -----BEGIN PGP SIGNATURE----- Version: 2.6.2 Comment: Gratis auto-signing service iQBFAwUBLvd92CoZzwIn1bdtAQF3mgGAmf8CJP9LyBVJZnWjCq/PFDtEdneMM6kn 4u8pR09jRndd7g/LWf6NaJFnMJCTzsA4 =BKMk -----END PGP SIGNATURE-----

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C code contest
by Tony.Gurnick＠nzdairy.co.nz 17 Dec '03

17 Dec '03

Elton(a)sybase.com wrote: >I gather that this was one of the entries in the "obfuscated 'C'" >programming contests that used to be held some years ago. >(Are they still held?) Yep, Mail chongo(a)TOAD.COM, co-incedentally T

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Re: hiding strings in binaries
by elton＠sybase.com 17 Dec '03

17 Dec '03

>I didn't write this program and I don't know how it works. It was posted >on the nyx freenet by kstern(a)nyx.cs.du.edu. When you compile and run it, >it prints out the lyrics to "The Twelve Days of Christmas". I didn't write it either, but a friend asked how the hell it did that, so I hacked on it for a couple hours and now I _do_ know how it works: it's a substitution cipher just like rot-13, coupled with a selector to print phrases in a predetermined order. This string: >"!ek;dc i@bK'(q)-[w]*%n+r3#l,{}:\nuwloca-O;m .vpbks,fxntdCeghiry" contains the substitution cipher. All the letters of the song are in the 2nd half of the string, starting at '\n'. The substitutions are the first half of the string. The program searches for a match in the index section; when it finds a match, it adds a constant to that character's array index to get the index of the character to print. Thus, searching for '!' causes '\n' to print; searching for 'e' gets 'u'. This string: >"@n'+,#'/*{}w+/w#cdnr/+,{}r/*de}+,/*{*+,/w{%+,/w#q#n+,/#{l,+,/n{n+,/+#n+,/#\ >;#q#n+,/+k#;*+,/'r :'d*'3,}{w+K w'K:'+}e#';dq#'l \ >q#'+d'K#!/+k#;q#'r}eKK#}w'r}eKK{nl]'/#;#q#n'){)#}w'){){nl]'/+#n';d}rw' i;# \ >){nl]!/n{n#'; r{#w'r nc{nl]'/#{l,+'K {rw' iK{;[{nl]'/w#q#n'wk nw' \ >iwk{KK{nl]!/w{%'l##w#' i; :{nl]'/*{q#'ld;r#n'}{nlwb!/*de}'c \ >;;{nl'-{}rw]'/+,}##'*}#nc,',#nw]'/+kd'+e}+;#'rdq#w! nr'/ ') }+}{rl#'{n' ')# \ >}'+}##(!!/" is the phrases of the song. Each '/' character is the end of a phrase: "@n'+,#'" == "On the "; "*{}w+" == "first"; "w#cdnr" == "second"; etc. The rest of the program is a selector to choose which phrase to print next. It doesn't run everywhere (it presumes its character set is 7-bit ASCII), and it depends on being invoked with no arguments. (Try it with one or two arguments -- see what happens! It redefines the standard main() argument 'argv' as an integer purely so that it can be 100% recursive, and depends on 'argc' being zero in the outermost level.) It's one busy s.o.b., too, because _every_ increment of the lookup index is a separate function call, as is the phrase selector and character printer. I gather that this was one of the entries in the "obfuscated 'C'" programming contests that used to be held some years ago. (Are they still held?) -- Elton

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Re: (fwd) Newt says Clipper Chip is Dead
by jrochkin＠cs.oberlin.edu 17 Dec '03

17 Dec '03

At 5:44 PM 12/19/94, James A. Donald wrote: >On his weekly call-in TV show on National Empowerment Television tonight, >Newt received a call asking about his opinion on the Clipper Chip, and he >replied that it was a moot point, in that the Clipper chip concept was >designed for a condition that no longer exists. Eh? What condition is that? I don't understand. What condition used to exist that required the deployment of the Clipper Chip, that no longer exists? What was he talking about?

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Re: c'punks top 5
by lcottrell＠popmail.ucsd.edu 17 Dec '03

17 Dec '03

-----BEGIN PGP SIGNED MESSAGE----- >Adam Shostack <adam(a)bwh.harvard.edu> writes: >> Whats wrong with PGPtools? (A lack of documentation. Been >> a while since I looked, but I think it lacked a high level >> interface. The low level stuff is great, but on the mac, I can >> send an Appleevent "Encrypt *file recipient" and, some extended >> period later, get a response. > >It has been a while since I looked too, does it work with the 'new' format >messages generated by MIT pgp? Does anyone actually USE pgptools for any >available applications? As far as I know, nobody uses it. If nobody uses >PGPtools, then what is the reason? Either nobody really wants a PGP library >(which isn't true judging from the inquiries on cypherpunks), or something is >wrong with PGPTools. Is it the documentation like you said? Maybe some of >us should pick up where pr0duct cypher left off and enhance PGPTools. This >brings me to another point: > I use PGPTools. It is the crypto engine for Mixmaster. I have been having problems with it though. It works fine with PGP2.6 messages. > <BIG SNIP> >andrew -----BEGIN PGP SIGNATURE----- Version: 2.6 iQCUAwUBLvZ0SVVkk3dax7hlAQG6AwP42xb6cPFWhMMPY83Vv/Q6akWBCuccbEqP RaAaz/iVJHdP6WLdItPSvpZQsp0KL6+pfqAwH3IMZd0a/ixJyFAEGOQ1gr/OQjCC fKYVfH5K6C1j5GMy9dLFKbWCxKk7n/3e1is3nNtoV6kqMsJxlo3WBWgtEWOz+WrE 8EZv9EwmdA== =Wg/K -----END PGP SIGNATURE----- -------------------------------------------------- Lance Cottrell who does not speak for CASS/UCSD loki(a)nately.ucsd.edu PGP 2.6 key available by finger or server. Encrypted mail welcome. Home page http://nately.ucsd.edu/~loki/ Home of "chain" the remailer chaining script. For anon remailer info, mail remailer(a)nately.ucsd.edu Subject: remailer-help "Love is a snowmobile racing across the tundra. Suddenly it flips over, pinning you underneath. At night the ice weasels come." --Nietzsche

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SSL server experiment
by Hal 17 Dec '03

17 Dec '03

Here is a perl script which connects to a netscape-style "https" server. The results of running it with "https.pl home1.mcom.com 443" is: Attempting connection to 198.93.93.10 Connected Sent message, length 40 Received length = 502 Message type = 4 Session ID Hit flag = 0 Certificate type = 1 Server version = 2 Certificate length = 472 Cipher specs length = 3 Conn ID length = 16 Supported ciphers: RC4_EXPORT40, 128 bits This way you can see which of the 5 cipher options (RC4 or RC2 in full and export versions, plus IDEA) are supported by any given server. You always use port 443 and just specify the machine name. I was a little surprised that Netscape's own server is only running the 40 bit version. I hope the export restrictions will not prevent the use of full strength ciphers. Here is the script, which I call https.pl: #!/usr/local/bin/perl # Perl script to test connection to http ssl port # Usage: https machine port # Standard internet stuff $AF_INET = 2; $SOCK_STREAM = 1; ($name, $aliases, $proto) = getprotobyname('tcp'); $sockaddr = 'S n a4 x8'; # Parse if (@ARGV == 2) { ($them, $port) = @ARGV; } else { die "Usage: $0 machine port\n"; } select (S); $| = 1; select (STDOUT); socket (S, $AF_INET, $SOCK_STREAM, $proto) || die "socket: $!"; ($name, $aliases, $type, $len, $thataddr) = gethostbyname($them); $that = pack ($sockaddr, $AF_INET, $port, $thataddr); @thataddr = unpack('C4', $thataddr); $thataddr = join('.', @thataddr); print "Attempting connection to $thataddr\n"; die $! unless connect (S, $that); print "Connected\n"; $cli_hello = 1; $vers = 2; $msg = pack ("C n4", $cli_hello, $vers, 5*3, 0, 16); $challenge = pack ("d2", rand, rand); #16 bytes $cspecs = pack ("Cn"x5, 1, 128, 2, 128, 3, 128, 4, 128, 5, 128); $len = 1+8+5*3+0+16 + 32768; $h = pack("n", $len); $totmsg = pack("a2 a9 a15 a16", $h, $msg, $cspecs, $challenge); print S $totmsg; print "Sent message, length ", $len-32768, "\n"; # Now for the interesting part read (S, $phd, 2); ($slen) = unpack ("n", $phd); print "Received length = ", $slen-32768, "\n"; read (S, $pm1, 11); ($smsg, $ssess, $scert, $sver, $sclen, $scspeclen, $scidlen) = unpack ("C3 n4", $pm1); print "Message type = $smsg\n"; print "Session ID Hit flag = $ssess\n"; print "Certificate type = $scert\n"; print "Server version = $sver\n"; print "Certificate length = $sclen\n"; print "Cipher specs length = $scspeclen\n"; print "Conn ID length = $scidlen\n"; if ($sclen) { read (S, $scert, $sclen); } read (S, $pspecs, $scspeclen); $nscspecs = $scspeclen / 3; @scspecs = unpack ("Cn" x $nscspecs, $pspecs); @ciphernames = ( "(undefined)", "RC4", "RC4_EXPORT40", "RC2", "RC2_EXPORT40", "IDEA" ); print "Supported ciphers:\n"; for ($i=0; $i<$nscspecs; ++$i) { printf ("\t%s, %d bits\n", @ciphernames[@scspecs[2*$i]], @scspecs[2*$i+1]); } read (S, $scid, $scidlen); close S; exit 0;

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Physical location of a machine
by Jonathon Fletcher 17 Dec '03

17 Dec '03

>From David Harvey's list of places holding pgp outside the us: ftp://ftp.uu.net/pub/security/virus/crypt/pgp where, physically, is this machine (country). -Jon -- Jonathon Fletcher, j.fletcher(a)stirling.ac.uk

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Mac PGPTools
by lcottrell＠popmail.ucsd.edu 17 Dec '03

17 Dec '03

-----BEGIN PGP SIGNED MESSAGE----- I have a Magic Money client for the Mac, so PGPTools MUST have been ported to the Mac. Does anyone know where I might find the source for Mac PGPTools? I am starting to think about porting the Mixmaster front end to the Mac. Thanks. -----BEGIN PGP SIGNATURE----- Version: 2.6 iQCVAwUBLvaQflVkk3dax7hlAQHwcQP+IQrZMS05Vtw/hNJKoR9hv61joYlv2CtP pyOzWMFW5gHopc29UR1lI311MJnnj3/vDRLhVtN3hDNGl4LsS6s6xNIRPpKdeoaT 0ESSGaWq7ddmVmFmhcta9b1sX8GsoHrJbjjDXTcOEKICo+0qZlHzgtGvLfArl0or /MI7guanhH0= =FqTm -----END PGP SIGNATURE----- -------------------------------------------------- Lance Cottrell who does not speak for CASS/UCSD loki(a)nately.ucsd.edu PGP 2.6 key available by finger or server. Encrypted mail welcome. Home page http://nately.ucsd.edu/~loki/ Home of "chain" the remailer chaining script. For anon remailer info, mail remailer(a)nately.ucsd.edu Subject: remailer-help "Love is a snowmobile racing across the tundra. Suddenly it flips over, pinning you underneath. At night the ice weasels come." --Nietzsche

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